A rectangular frame of wire is placed in a uniform magnetic field directed outwards normal to the paper. AB is connected to a spring which is stretched to A'B' and then released at time t = 0. Explain qualitatively how induced emf in the coil would vary with time. Neglect damping of oscillations of spring.

A rectangular frame of wire is placed in a uniform magnetic field dire

1.	A rectangular frame of wire is placed in a uniform magnetic field directed outwards normal to the paper. AB is connected to a spring which is stretched to A'B' and then released at time t = 0. Explain qualitatively how induced emf in the coil would vary with time. Neglect damping of oscillations of spring.
Answer» Solution :When the spring is stretched and released, it oscillates to and fro SIMPLE harmonically. As a result the wire AB ALSO oscillates to and fro about its equilibrium position AB. Due to oscillation of wire AB, magnetic flux linked with 10 the rectangular wire frame CHANGES and hence an INDUCED emf/current is SET up in it. The induced current also oscillates simple harmonically as shown in Fig. 6.45.

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